Prosthetic spur



FIG. 1 is an environmental perspective view of a plastic spur showing my new design;

FIG. 2 is a right side elevational view thereof, with the opposite side being a mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof.

The broken line showing of a cock's foot in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a prosthetic spur, as shown and described. 